Visual Builder
Edit the raw regex directly, then use “Import regex” to rebuild the visual tree when possible.
Visual regex workbench
CreateRegex v4
Build, test, explain and master regex with visual tools, guides, examples and a growing regex library.
A complete platform to build, test and learn regex
CreateRegex brings together a visual regex builder, live tester, human explanations, practical examples, guides and a complete library to help you learn and master regular expressions.
The tool supports groups, quantifiers, character classes, lookaheads, lookbehinds, captures, alternatives, Unicode and many other advanced regex features. It also includes a live tester, diagnostics, interactive examples and compatibility checks for JavaScript, PHP/PCRE, Python, Java, .NET and Ruby.
Regex guides and examples library
Explore practical guides covering email regex, URL regex, lookbehind assertions, regex engine differences and a complete regex cheatsheet. Every example can be tested instantly or opened directly in the visual builder.
Password Regex
Validate password strength, length and security policies.
4 examples
Email Regex
Test and understand practical email patterns you can adapt.
16 examples
URL Regex
Validate or extract URLs with interactive examples.
2 examples
Phone Number Regex
Validate international, French, US and E.164 phone numbers.
5 examples
Username Regex
Validate usernames, handles, slugs and account names.
6 examples
Date Regex
Validate DD/MM/YYYY, ISO dates and timestamps.
5 examples
IP Address Regex
Validate IPv4, private IP ranges, CIDR notation and IPv6 basics.
5 examples
UUID Regex
Validate UUID v4, UUID v1-v5 and UUIDs without hyphens.
4 examples
Hex Color Regex
Validate CSS hex colors like #fff, #ffffff and alpha colors.
6 examples
Domain Name Regex
Validate domains, subdomains, TLDs and lowercase domain names.
6 examples
Slug Regex
Validate SEO-friendly slugs and URL-safe identifiers.
5 examples
Credit Card Regex
Validate credit card number formats and understand regex limitations.
15 examples
Regex Cheatsheet
Quickly find anchors, classes, groups and quantifiers.
5 examples
Regex Tutorial
Learn regular expressions step by step from the basics.
3 examples
Regex Limitations
Understand what regex can and cannot validate.
Guide
Testing Regex
Learn how to test regex patterns properly.
Guide
Regex Compatibility
Understand regex differences between engines and languages.
Guide
Regex Performance
Learn how to write fast and efficient regex patterns.
Guide
Input Validation Best Practices
Build reliable and secure input validation.
Guide
Common Regex Mistakes
Avoid the most common regex mistakes.
Guide
JavaScript Lookbehind
Understand lookahead, lookbehind and compatibility limits.
2 examples
JavaScript Regex vs PCRE
Compare regex engines, flags and feature support.
2 examples
Character Classes
Understand regex character classes and shortcuts.
10 examples
Quantifiers
Understand repetition and regex quantifiers.
8 examples
Groups
Understand regex groups and captures.
9 examples
Anchors
Understand regex anchors and boundaries.
8 examples
Alternation
Understand regex alternatives and OR logic.
8 examples
Lookarounds
Understand lookaheads and lookbehinds.
8 examples